ES2248001T3 - CONTINUOUS MANUFACTURING IN CONTINUOUS SELF-ADHESIVE ITEMS THROUGH THE COATING OF MATERIALS IN THE FORM OF A CONTINUOUS TAPE WITH POLYURETHANS OF TWO COMPONENTS. - Google Patents

Abstract

Method for the continuous manufacture of self-adhesive articles, whereby a) basically a polyol-based component is placed in a container A and an isocyanate-based component in a container B. b) in a mixer the polyol component and the isocyanate component are mixed c) the mixed polyurethane mass is then applied on a support material coated with a pressure sensitive adhesive composition c2) to the polyurethane mass of the sheet is added a second support material d) the sheet of the first support material, the adhesive composition and the polyurethane mass are passed through a heating channel, in which the polyurethane mass, d2) hardens after the heating channel is removed Second support material. e) the sheet is then rolled in a winding station

Description

Continuous item manufacturing method self-adhesive by coating materials in the form of continuous tape with two component polyurethanes.

The present invention relates to a method for the continuous production of self-adhesive items, such as of self-adhesive tapes, by coating two materials fed at the same time, arranged on top of each other in parallel to the surface, tape-shaped and not in contact with one with another, with a two component polyurethane support material reagents, so at least one of the materials in the form of tape is provided with a pressure sensitive adhesive composition (self-adhesive composition).

The self-adhesive article on the one hand consists of at least two layers, that is, a non-self-adhesive support layer and of the pressure sensitive adhesive composition applied thereto. A self-adhesive tape on both sides is generally formed of at least three layers, that is, the support layer and the layers of adhesive applied on both sides. The exceptions are the self-adhesive articles on both sides, in which the support and the adhesive layer are identical (called product monolayer).

The mechanical properties of an adhesive tape (for example, tear resistance, ductility, elasticity) are basically defined by the support. He support further defines the optical properties of an adhesive tape (transparency, color) as well as in the case of an article self-adhesive on the one hand, the surface properties of the side do not self-adhesive (structure: roughness, surface tension). Even The adhesive properties of a self-adhesive article are defined for the support material.

As support materials they have in consideration of all materials in the form of tape or strip, for for example, papers, fabrics, fleece, sheets or elastomers, of different thicknesses, structures and polymer compositions, respectively.

The adhesive layer defines in combination with the corresponding support employed the adhesive properties of a self-adhesive article, which are expressed in times of shear, adhesion force, Kipp behavior, way of getting up, ability to take off again and others.

Base polymers of adhesive substances modern are, among others, natural rubber and synthetic rubber, polyacrylates, block copolymers with block percentage of polystyrene, polyethylene acetates and polyurethanes, which they will be used mostly in combination with additives such as resins and plasticizers and / or other additives such as, for example, antioxidants, UV protective media or additives rheological

The general method used for production of adhesive tapes consists of coating a support material in form of tape that is manufactured separately, with an adhesive mass. He coating is carried out by means of a solution, that is, the self-adhesive mass before coating is transformed with help of solvents in a consistency capable of applying by brush.

The coating can be done, depending on the polymer composition, from the melt in a method Solvent-free extrusion. This method has been carried out. especially with elastomer-based adhesive substances thermoplastics

In addition the bonding support and adhesive composition can be done so that the adhesive composition is applied initially on a non-adhesive medium and then applied to the support in a gluing procedure.

The lining of support materials in form of tape with adhesive masses as a method of manufacturing articles Self-adhesive has given a good result on multiple occasions.

However, there are some drawbacks fundamental, that in the case of adhesive tapes with profiles very high or special requirements are very harmful. Thus in many cases the anchoring of the adhesive mass on the support It is problematic and requires another stage of the process, that is, the coating with an adherent bottom (first layer). In case of a Adhesive tape on both sides must be made naturally by both sides, so that a product configuration is obtained of five layers. Also in the market no supports are marketed cut to size, such as those needed for applications special. The useful thing is joining systems from supports individual, which have the disadvantage that, for example, they should assemble with adhesive systems and adherent bottoms or with the application of additional auxiliary layers (for example, layers barrier against migration of substances inside the support towards the adhesive layer or mirror layers for the brightness of the rough support surfaces). This results in an increase in complexity in the manufacturing process and ultimately some high manufacturing costs

Some tapes must be represented below adhesives, type example, according to current technology and in particular those that use polyurethane or the support material as polyurethane sheets.

From WO 86/00536 A1 a base sheet is known of a polyurethane and a pressure sensitive adhesive layer, in the that the sheet is used for a tablet packaging. Consists on a polyurethane sheet provided with a coating self-adhesive, which wraps a tablet and at the same time sticks to the user's skin with the tablet.

In US 5,127,974 A a sheet a is mentioned base of a polyurethane sheet with a self-adhesive coating. This sheet is specially used for the temporary protection of lacquered car surfaces.

From DE 196 14 620 A1 and DE 197 33 014 A1 a self-adhesive tape coated with an adhesive mass is known for both sides, pressure sensitive, whose support is formed by a formulated, crosslinked and non-foaming polyurethane.

The support components are a polyurethane crosslinked, non-foamed, filling material and if necessary Other auxiliary substances

According to DE 196 14 620 A1 the proportion of Polyurethane in a support is up to 50% by weight, preferably from 30% by weight up to 40% by weight, whereby the Polyurethane is free of plasticizers. Filling materials equivalent to 50% by weight up to 70% by weight of the support.

According to DE 197 33 014 A1, the percentage of Polyurethane in the support is up to 50% by weight, preferably from 10 to 40% by weight. The materials of padding equals 40% by weight up to 70% by weight of the support, while plasticizers and resins together equal 5% in weight up to 30% by weight, in particular 10% up to 25% in weight.

The choice of the isocyanate component of the Polyurethane is governed according to the properties of the support that is adapt according to the objective. They take into account, for example, the toluylene diisocyanate, diphenylmethane-4,4'-diisocyanate, dicyclohexylmethane-4,4'-diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, mixtures of the so-called isocyanates or derivatives thereof, by example, dimerized or trimerized types.

The choice of the component that will react with the isocyanate it also depends on the desired requirement profile of the support properties. For example, all questions are questioned diols, triols and polyester polyols, diols, triols and polyether polyols, diamines, triamines, polyamines of polyether, the hydroxy functionalized polybutadiene as well as all monovalent alcohols (mono-oles), amines monovalent (mono-amines), polyether mono-oles, polyester mono-amines or products derived from the four groups above mentioned.

It has been shown that it is preferable that polybutadienes hydrolyzed by a hydroxyl, polyester diols, polyestertrols, polyester polyols, polyether diols, polyether triols, polyether polyols, polyether diamines, polyetherriamines, polyether polyamines have a molecular weight M_ {g}? 1000 g / mol.

The purpose of the present invention is to have a method with which you can continuously manufacture the self-adhesive items, without the material being manufactured separately tape-shaped support of the self-adhesive article and then should be coated with an adhesive composition by a method of pasted or in a direct application, so that they cannot appear the main drawbacks of the current manufacturing method for adhesive tapes in the form. The support must be characterized by a Property profile adjustable many times and variable.

This task is solved by a method, as set forth in the main claim. The object of the subclaims are therefore the preferred configurations of the method.

Accordingly, the invention relates to method described below for the continuous manufacture of self-adhesive articles, whose support contains a polyurethane as base polymer:

The method according to the invention consists of both of each of the following steps:

to)

Be basically put in a container A a component based on a polyol and in a container B a component based on isocyanate

b)

In a mixer mix the polyol component and that of isocyanate

C)

The formed polyurethane mass is then applied on a material support coated with an adhesive composition sensitive to pressure, preferably moving at a speed constant.

d)

The sheet of support material, adhesive composition and mass of Polyurethane is passed through a heating duct, in the which polyurethane dough hardens.

After the heating channel the Second support material.

and)

The sheet is then rolled in a station rolled.

In a stage of preparation to the support material a composition is incorporated on one or both sides adhesive This step is performed in a coating process current, starting from a solution or a melt. He support material may be a non-adhesive medium, for example, a paper or a separator sheet. But it can also be any other support material, for example, a paper, a fabric, a fleece a sheet or an elastomer, which after the last stage of the process it is equivalent to a part of the total support of the article self-adhesive

In the case where the support material is a medium endowed with a non-adhesive material, the polyurethane mass is Applies to the coated support material of an adhesive composition pressure sensitive so that the polyurethane dough is found on the pressure sensitive adhesive composition. For the case where there is no means in the support material adhesive, the polyurethane dough will preferably be applied on the side of the support material in which none is found pressure sensitive adhesive composition. But nevertheless, alternatively, in this case the mass of polyurethane to the pressure sensitive adhesive composition. Then another layer of adhesive should be applied to the outer side of the support material

The polyurethane mass of the sheet is apply a second support material preferably to a constant velocity.

In a preferred form of the procedure this second support material is provided with an adhesive composition pressure sensitive.

In this case, a stage of additional preparation in which the first stage of preparation, so that both the adhesive composition and the Tape-shaped material must be identical to those of the first preparation stage

After the heating channel or conduit, Remove the second support material.

It is also preferable that there are others containers prior to the mixer, in which the catalysts, plasticizers, dyes and other additives that are can add

The coating with the reactive polyurethane of two components on the first support material is made preferably in a standard standard coating plant for the manufacture of adhesive tapes.

Figure 1 shows this installation in A preferred embodiment.

The 100th floor has two bullet developments 11, 12 for materials circulating 1 and 2, plus a product winding station 21 as well as a winding of bullets 22 for an optionally coated auxiliary material 3. In addition, plant 100 has a heating channel 31, in the which hardens the polyurethane dough 4.

Materials 1 and 2 in the form of tape that circulate move in such a way that the lining of the dough of polyurethane 4 can be made directly in the groove between both materials 1 and 2. The width of the slit is variable and is can adjust freely.

Behind the cleft there is a guide that here is not it is displayed, of the second support material 2 on a woven tape preferably when it comes to getting a good constancy of the thickness of the support material 4 of polyurethane.

In the case of an article that does not have adhesive the development of superior bullets can be suppressed as well as the development of bullets for auxiliary material 3.

Alternatively, a material can be used that does not carry adhesive, that only has the function of maintaining out of contact shaft and reactive polyurethane to avoid hardening of the polyurethane in the shaft.

The carrier material of reactive polyurethane 4 is manufactures continuously immediately before application to base of two components that react chemically, that is a previously formulated polyol component (A) and a component of isocyanate (B), which are found respectively in a container 41 or 42, in a mixing head (dynamic mixer) or in a mixing tube (static mixer) of an installation of mixing and dosing of two components 43, and applying directly between materials 1 and 2 in the form of tape.

As mixing and dosing installation of two components 43, is considered any frequent plant in the market that is suitable for smelting and is prepared for application periods that are generally less than one minute. This can occur both in a static mixing system and dynamic. In order to cover the corresponding materials 1 and 2 in all its breadth with the polyurethane support material 4, it is preferable to install the mixing head or mixing tube so that they move in a transverse direction, which then oscillatingly transport the width of the materials corresponding.

In the next step through the conduit of heating 31, the reactive polyurethane mass 4 hardens and is It usually binds chemically to the circulating materials, it is Tell the adhesive layers. The bond to an acrylate is done by example forming a carboxylic acid amide. After passing through Channel 31 coils the finished final product.

The passage through the heating channel 31 is preferably maintained at temperatures between 20 ° C and 120 ° C.

In the case of an adhesive tape by both sides you get a three layer product structure that consists of of an adhesive mass, a polyurethane support, an adhesive mass. No adherent bottom and no additive layer is needed. He support thickness can be adjusted comfortably by the width of the cleft Since the polyurethane components (A) and (B) They do not contain any solvent, they can be manufactured with this method even very thick supports without any blister.

In a possible execution form the support It has a thickness of 0.1 to 50 mm, preferably 0.4 to 20 mm The adhesive composition preferably has a weight of application of 10 g / m2 to 100 g / m2.

The polyurethane support material is consider all materials, which contain as a base polymer a polyurethane and are manufactured in a method of mixing two components. The diversity of polyurethane chemistry, which is gets from the large amount of polyurethane contributions made by the chemical industry of the raw material, such as also of the various possibilities of compound formation with filler material, resins, plasticizers, other polymers, for example, epoxides, acrylates, natural and synthetic rubbers, ethylene vinyl acetates, block copolymers with block parts of polystyrene and various additives as anti-aging media, UV protection means or rheological additives, facilitates that according to this method self-adhesive articles are prepared, cut to size, for many fields of application.

In addition, all foam materials, which contain a polyurethane as a base polymer and are manufactured in a multi-component mixing method, are taken into account as the polyurethane support material. The structure of the foam can be achieved both chemically, for example due to a reaction of the isocyanate / water dissolved during the mixing process or due to the propellant, as well as physically by the entry of a gas (for example, nitrogen or air). The gas can be introduced both in the manufacture of component A or B and directly in the mixing head of a dosing and mixing system of several components. The gas introduced in the mixing head is almost equivalent to the special case of a third
component.

It is expressly demonstrated in the representation of Polyurethane Chemistry in the "plastics manual, 7, polyurethane, Becker / Braun (1993) ".

A possible form of support execution encompasses as components a cross-linked, non-foaming polyurethane, filling materials and if necessary other substances auxiliary

The percentage of polyurethane in the support is almost 50% by weight, preferably 30% by weight, up to 40% by weight, so the polyurethane is free of plasticizers. He filling material corresponds to 50% by weight up to 70% by weight of the support.

The choice of the isocyanate component of the Polyurethane is governed by the support properties adjusted according to the objective. For example, the diisocyanate of toluylene, diphenylmethane-4,4'-diisocyanate, dicyclohexylmethane-4,4'-diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, mixtures of the so-called isocyanates or derived isocyanates chemically, for example, the trimerized and dimerized types.

The choice of components that reacts with the isocyanate is also governed by the properties of the support that They are adjusted depending on the desired requirement profile. For example, all diols, triols and polyols of Polyester, diols, triols and polyether polyols, diamines, triamines, polyether polyamines, functionalized polybutadiene with the hydroxyl group as well as all monovalent alcohols (mono-oles), monovalent amines (mono-amines), mono-oles of polyether, polyether mono-amines or products derived from the four groups mentioned.

It has been shown that it is preferable that polybutadienes functionalized by a hydroxyl, the polyester diols, polyestertrols, polyester polyols, polyether diols, polyether triols, polyether polyols, polyether diamines, polyetherriamines, polyether polyamines have a molecular weight M_ {g}? 1000 g / mol.

In addition to the isocyanate components mentioned above and of the components that react with they can use other educts for the formation of polyurethane, not forgetting the basis of the invention.

To accelerate the reaction between the component of isocyanate and the component that reacts with the isocyanate can all catalysts known to those skilled in the art, such as example, tertiary amines or organic compounds of tin.

Polyurethanes are mentioned as already indicated earlier in "Ullmann's Encyclopedia of Industrial Chemistry, Vol A21: Polyurethanes ".

In a particularly preferred embodiment an NCO / OH ratio is adjusted from 1.0 to 1.3, preferably from 1.0 to 1.1 for the formation of polyurethane.

The preferred percentage of Mono-ol-OH in the total percentage of OH, that is, the breaking part of the chain is between the 5% and 40%, preferably between 10% and 30%.

As fillers can be used both reinforced materials such as carbon black and not reinforced, such as Crete or barium sulfate. Other examples are talc, mica, pyrogenic silicic acid, silicates, zinc oxide, microglobes, microbolites filled with glass, hollow glass microballs and / or plastic microballs of all kinds. Even mixtures of The substances mentioned.

In the case of microglobes it is balls hollow elastic, thermoplastic, which have a wrap polymeric These balls are filled with low point liquid boiling or fluid gas. As wrap polymers are Acrylonitrile, PVDC, PVC or acrylate are especially suitable. The low boiling liquid takes into account the hydrocarbons such as minor alkanes, for example pentane, such as Fluid gas chemical substances such as isobutane.

Especially preferred properties are characterized in that in the case of microglobes it is diameter at 25 ° C is between 3 µm and 40 µm, in particular between 5 µm and 20 µm.

By heating the capsules expand irreversibly and expand in three dimensions. The expansion is limited when the internal pressure is equalized and Exterior. Thus a foam support of closed pores is obtained, which It is characterized by good flow behavior and high recovery force

After thermal expansion and due to the high temperature, the microglobes have a diameter of 20 to 200 µm, in particular from 40 to 100 µm.

To increase the stability against aging of the polyurethane, it can be mixed with frequent anti-aging media, which depending on the type of application can come from the kind of anti-aging media that change color or not, and are in the range between 0 % by weight and 5% by weight, as well as photoprotective media between 0% by weight and 5% by weight or means that protect from ozone between 0% and 5%
in weigh.

To get no blisters appear they can also add drying agents, such as calcium oxide or molecular sieve zeolite, in particular in a proportion between 0% and 10% by weight.

All auxiliary substances mentioned they can be used according to the purpose of the application alone or in combination with each other to make the polyurethane dough, and achieve optimal performance in your application. Through employment of these additives it is possible the dark coloration like the one required in the car industry.

Components A and B are obtained either directly buying them or after a mixing or manufacturing process, corresponding to current technology, for example, according to the setting rheological and content in filler material, each of the components that can be purchased are manufactured in a container of stirring, in a planetary mixer or in a solvent.

The characteristic property of the method according to The invention is the inverted mode of the coating.

An adhesive mass is not applied to a support, such as It is usual, but a reactive support material, initially liquid, is armed or equipped with a prepared adhesive mass or if precise of other materials, of which at least one with a mass pressure sensitive adhesive.

An advantage of the method is that it can be achieved a good anchor between the polyurethane support material and the tape-shaped materials, that is, for example, the adhesive mass, without having to resort to an adherent bottom or layers Similar. This depends on the polyurethane support material in a moment of the coating is reactive and therefore a spontaneously chemically to many substrates.

Another advantage is the simplicity of the method that allows to manufacture a maximum of three layers of coating (manufacture of circulating material 1, if manufacturing is required of the circulating material 2, coating with the support material of polyurethane) even built in a complex way, that is, a self-adhesive article containing a support compound with a cost especially advantageous.

In relation to polyurethane coating Two-component coating is not necessary or Additional glue to manufacture the self-adhesive article.

Another advantage of the method is that they can be manufactured A diversity of self-adhesive items. This diversity is obtains from the many possibilities already mentioned of chemistry of polyurethane and the multiple possibilities in what refers to circulating materials 1 and 2.

With the help of the following examples you can The invention will be described without being limited.

The following test methods have been used to briefly characterize the sample manufactured according to the method described:

?

The bond strength is determined according to BDF JOPMA002.

According to this method the sample of adhesive tape to be analyzed was applied to the adherent bottom (steel) and then it took off in some conditions determined in a tensile testing machine. He take-off angle was 180º respectively, the speed of 300 mm / min The force required for takeoff is the force of adherence.

?

The determination of the tear resistance and breakage elongation was performed in a tensile test according to BDF JOPMC001.

To do this placed a test strip 100 mm long and 25 mm wide in a tensile testing machine with a tightening speed (300 mm / min) defined in a longitudinal direction, until it tore. The tear resistance with respect to the sample section as well as the expansion in strength of tear.

?

The hardness of the highlight is determined according to DIN 53577.

The hardness of highlighted is the voltage found in the charging process (in the 14% examples) with respect to the preset deformation. The determination was made in a compression testing machine. The dimensions of the sample were 30 mm x 30 mm x 15 mm (LxBxH). The height of the sample was adjusted by stacking of adhesive tapes.

In the examples, the coating was carried out in a plant of the company Pagendarm. The plant had the possibilities represented in the winding figure 1 and winding for materials 1 and 2 with a tape width of 50 cm. The width of the lining groove was adjusted so variable between 0 and 1 cm. The length of the heating channel was of approximately 12 m. The temperature in the channel was set to four zones and optionally between room temperature and 120 ° C.

A mixing facility was used and Dosage of the components of the company Spritztechnik-EMC. The mixing system was dynamic. The mixing head was designed for two components liquids and a third component in the form of gas. Mixing rotor It had a variable number of turns of up to a maximum of 5000 U / min. In the dosing pumps of this installation it was about gear pumps with a performance of approx. 2 l / min, as maximum.

Components A were prepared in a solvent Evacuable from the Drais company.

Examples

Example one

For the manufacture of a covering tape special (masking tape), which is used to cover the joints of glue of the edges of the windows during the process of lacquered in the mass production of cars after application of the first layer of paint (KTL paint), and thus protect from other layers of paint that are applied at temperatures up to 180 ° C, the process was used as follows:

1st Stage of the process (preparation stage), manufacture of material 1 to be applied:

A 23 µm thick polyester sheet (polyethylene terephthalate) was applied in a process of usual coating with a rubber-based adhesive mass natural, consisting of

48% Natural rubber CV50 2. 3% Resin poly-beta-pinene 5% Resin of terpenic phenol 3% Resin rosin 7% Acrylonitrile Copolymer and butadiene 8% Rust zinc 5% Reactive alkylphenol resin Y one% 2.5 di- (tertiary-amyl) hydroquinone

of a solution with a thickness of application of about 25 µm and on the roll it was covered with a paper usual separator in the Commerce.

2nd Stage of the process, coating with polyurethane:

The polyester sheet provided with an adhesive composition was coated in a second stage of the process by the non-adherent side, with a two-component polyurethane support mass, degassed, at a speed of 1 m / min. The application thickness was 120 µm. The hardening was carried out at a temperature of the channel of
80 ° C

The polyurethane support mass was composed by:

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Raw material Weight percentage (%) Component A Arcol 1030® 30.0 Arcol 1074® 10.0 Dilaurate dibutyl tin 0.2 Calcium oxide 5.0 Bayferrox 3920® 1.0 Omyacarb 4BG® 28.3 Component B Vestanat IPDI® 25.5

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The adhesive tape thus obtained has a tear strength of 30.3 N / mm2 for elongation of 43.4% break. The adhesive strength to steel was 4.9 N / cm.

The adhesive tape could be lacquered again and which refers to the combustion conditions of the lacquer era sufficiently stable to temperature changes.

Example 2

For the manufacture of a covering tape special, like the one in example 1 that serves to cover the joints of glueing the edges of the windows during the process of lacquered in the mass production of cars after application of the first layer of paint (KTL paint), and thus protect from other layers of paint that are applied at temperatures up to 180 ° C, and that it is also so flexible that it can easily adhere to curves, the process was used as follows:

1st Stage of the process (preparation stage), manufacture of material 1 to be applied:

An acrylate adhesive composition based on a solvent, consisting of butyl acrylate (47.5%), acrylate ethylhexyl (47.5%), glycidyl methacrylate (2%), acrylic acid (3%) and small amounts of a known crosslinker extended with an application thickness of 40 g / m2 on a separating paper double-sided usual in commerce, dried, reticulated and It finally rolled over.

2nd Stage of the process, coating with polyurethane:

The acrylate adhesive composition spread on the separator paper was coated in a second stage of the process directly by a two-component polyurethane support mass, degassed, at a rate of
3 m / min The application thickness was 250 µm. The hardening was carried out at a channel temperature of 60 to 70 ° C.

The polyurethane support mass was composed by:

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Raw material Weight percentage (%) Component A Poly THF 250® 14.3 Poly THF 650® 37.6 Dilaurate dibutyl tin 0.1 Calcium oxide 10.0 Bayferrox 3920® 1.3 Aerosil R 202® 2.0 Component B Desmodur CD® 34.7

The adhesive tape thus obtained has a tear strength of 20.0 N / mm2 for elongation of 195% break. The adhesive strength to steel was 2.5 N / cm.

The adhesive tape could be lacquered again and which refers to the combustion conditions of the lacquer era sufficiently stable to temperature changes.

Example 3

For the manufacture of an adhesive tape for die-cut templates, elastic, resistant to sand spraying, the following method was used:

1st Stage of the process (preparation stage), manufacture of material 1 to be applied:

An acrylate adhesive composition based on a solvent, consisting of butyl acrylate (47.5%), acrylate ethylhexyl (47.5%), glycidyl methacrylate (2%), acrylic acid (3%) and small amounts of a known crosslinker extended with an application thickness of 40 g / m2 on a separating paper double-sided usual in commerce, dried, reticulated and It finally rolled over.

2nd Stage of the process, coating with polyurethane:

The acrylate adhesive composition spread on the separator paper was coated in a second stage of the process directly by a two-component polyurethane support mass, degassed, at a rate of
3 m / min The application thickness was 875 µm. The hardening was carried out at a channel temperature of 60 to 70 ° C.

The polyurethane support mass was composed by:

Raw material Weight percentage (%) Component A Arcol 1042® 29.0 Dilaurate dibutyl tin 0.1 Omyacarb 4BG® 63.1 Calcium oxide 5.0 Component B Desmodur CD® 2.8

The adhesive tape thus obtained has a tear strength of 1.7 N / mm2 for elongation of 124% break. The adhesive strength to steel was 2.5 N / cm.

The adhesive tape was strong enough when pulverized with sand and easily die-cut.

Example 4

For the manufacture of an adhesive tape for die-cut templates, elastic, resistant to sand spraying, not stretchable for a minimum tensile force the following method:

1st Stage of the process (preparation stage), manufacture of material 1 to be applied:

An acrylate adhesive composition based on a solvent, consisting of butyl acrylate (47.5%), acrylate ethylhexyl (47.5%), glycidyl methacrylate (2%), acrylic acid (3%) and small amounts of a known crosslinker extended with an application thickness of 40 g / m2 on a support slightly crumpled paper, usual in commerce, with a weight 68 g / m2 surface, dried, crosslinked and rolled It was coated with ordinary paper separator.

2nd Stage of the process, coating with polyurethane:

The slightly crumpled paper support provided with adhesive mass was coated in a second stage of the process by the non-adhesive side by a two-component polyurethane support mass, degassed, at a speed of
3 m / min The application thickness was 850 µm. The hardening was carried out at a channel temperature of 60 to 70 ° C.

The polyurethane support mass was composed by:

Raw material Weight percentage (%) Component A Arcol 1042® 29.0 Dilaurate dibutyl tin 0.1 Omyacarb 4BG® 63.1 Calcium oxide 5.0 Component B Desmodur CD® 2.8

The adhesive tape thus obtained was sufficiently resistant to sand spraying and easily die-cut The bond strength to steel was 2.1 N / cm

Example 5

For the manufacture of an adhesive tape for die-cut templates, elastic, resistant to sand spraying, not stretchable for a minimum tensile force the following method:

1st Stage of the process (preparation stage), manufacture of material 1 to be applied:

An acrylate adhesive composition based on a solvent, consisting of butyl acrylate (47.5%), acrylate ethylhexyl (47.5%), glycidyl methacrylate (2%), acrylic acid (3%) and small amounts of a known crosslinker extended with an application thickness of 40 g / m2 on a sheet of 23 µm thick polyester usual in the trade (polyethylene terephthalate), dried, crosslinked and on the roll it was covered with an ordinary separating paper.

2nd Stage of the process, coating with polyurethane:

The acrylate adhesive composition spread on the separator paper was coated in a second stage of the process directly by a two-component polyurethane support mass, degassed, at a rate of
3 m / min The application thickness was 850 µm. The hardening was carried out at a channel temperature of 60 to 70 ° C.

The polyurethane support mass was composed by:

Raw material Weight percentage (%) Component A Arcol 1042® 29.0 Dilaurate dibutyl tin 0.1 Omyacarb 4BG® 63.1 Calcium oxide 5.0 Component B Desmodur CD® 2.8

The adhesive tape obtained was sufficiently resistant to sand spraying and easily die-cut. The Adhesive force to steel was 2.8 N / cm.

Example 6

For the manufacture of a covering tape elastic that easily adheres to curves, for jobs lacquered and painted the procedure was used as next:

1st Stage of the process (preparation stage), manufacture of material 1 to be applied:

An acrylate adhesive composition based on a solvent, consisting of butyl acrylate (47.5%), acrylate ethylhexyl (47.5%), glycidyl methacrylate (2%), acrylic acid (3%) and small amounts of a known crosslinker extended with an application thickness of 40 g / m2 on a separating paper double-sided usual in commerce, which dried, reticulated and It finally rolled over.

2nd Stage of the process, coating with polyurethane:

The acrylate adhesive composition spread on the separator paper was coated in a second stage of the process directly by a two-component polyurethane support mass, degassed, at a rate of
3 m / min The application thickness was 300 µm. The hardening was carried out at a channel temperature of 60 to 70 ° C.

The polyurethane support mass was composed by:

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Raw material Weight percentage (%) Component A Arcol 1074® 31.5 Lutensol A07® 3.3 Dilaurate of dibutyl tin 0.1 Omyacarb 4BG® 53.9 Calcium oxide 7.9 Component B Desmodur CD® 3.3

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The adhesive tape obtained had a tear strength of 2.1 N / mm2 for elongation of 194% break. The adhesive strength to steel was 2.5 N / cm. The Masking tape could be painted and stuck in the curves.

Example 7

For the manufacture of an adhesive tape for edge protection the procedure of the mode was used next:

1st Stage of the process (preparation stage), manufacture of material 1 to be applied:

An acrylate adhesive composition based on a solvent, consisting of butyl acrylate (47.5%), acrylate ethylhexyl (47.5%), glycidyl methacrylate (2%), acrylic acid (3%) and small amounts of a known crosslinker extended with an application thickness of 40 g / m2 on a support thick woven polyester fabric (20 x 20 threads per cm in the warp and weft sense, purity: 34 Nm, weight superficial> 130 g / m2), dried, crosslinked and in the rolled was covered with a usual separating paper in the Commerce.

2nd Stage of the process, coating with polyurethane:

The fabric next to the adhesive composition is coated in a second stage of the process by the non-adhesive side of a two component degassed polyurethane support mass, to a speed of 3 m / min. The application thickness was 400 µm. The hardening was performed at a channel temperature of 60 up to 70 ° C.

The polyurethane support mass was composed by:

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Raw material Weight percentage (%) Component A Arcol 1042® 29.0 Dilaurate dibutyl tin 0.1 Omyacarb 4BG® 63.1 Calcium oxide 5.0 Component B Desmodur CD® 2.8

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The adhesive tape obtained had a tear strength of 19.1 N / mm2 for elongation of 24% break. The adhesive strength to steel was 2.9 N / cm.

Example 8

For the manufacture of an adhesive tape for edge protection of an especially advantageous price is He used the procedure as follows:

1st Stage of the process (preparation stage), manufacture of material 1 to be applied:

An acrylate adhesive composition based on a solvent, consisting of butyl acrylate (47.5%), acrylate ethylhexyl (47.5%), glycidyl methacrylate (2%), acrylic acid (3%) and small amounts of a known crosslinker extended with an application thickness of 40 g / m2 on a textile fleece 150 µm thick polyester with a surface weight of 70 g / m2, dried, crosslinked and coated in the coil usual separating paper in commerce.

2nd Stage of the process, coating with polyurethane:

The textile fleece next to the adhesive composition it was covered in a second stage of the process by the non-adhesive side of a two component polyurethane support mass, degassed, at a speed of 3 m / min. Application thickness It was 400 µm. The hardening was done at a temperature from the channel from 60 to 70 ° C.

The polyurethane support mass was composed by:

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Raw material Weight percentage (%) Component A Arcol 1042® 29.0 Dilaurate dibutyl tin 0.1 Omyacarb 4BG® 63.1 Calcium oxide 5.0 Component B Desmodur CD® 2.8

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The adhesive tape obtained had a tear strength of 9.8 N / mm2 for elongation of 18% break. The adhesive strength to steel was 2.6 N / cm.

Example 9

For the manufacture of an adhesive tape useful in the assembly of clichés for the printing industry was used The procedure as follows:

1st Stage of the process (preparation stage), manufacture of material 1 to be applied:

An acrylate adhesive composition based on a solvent, consisting of ethylhexyl acrylate (70%), acrylate stearyl (17%), acrylic acid (3%) and known resins (10%) are spread with an application thickness of 60 g / m2 on paper double-sided separator, dried, crosslinked and then rolled over.

2nd Stage of the process (preparation stage), manufacture of material 2 to be applied:

Process step 1 is repeated

3rd Stage of the process, coating with polyurethane:

Among the acrylate adhesive compositions spread on the separating paper of process steps 1 and 2 are carried out the coating with a polyurethane support mass of two components, degassed, at a speed of 1 m / min. He application thickness was 1.5 mm. The hardening was done at a channel temperature of 90 ° C.

The polyurethane support mass was composed by:

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Raw material Weight percentage (%) Component A Arcol 1042® 41.0 Arcol 1043® 41.0 Dilaurate dibutyl tin 0.2 Kronos 2160® 1.6 Calcium oxide 5.0 Aerosil R 202® 3.5 Component B Vestanat IPDI® 7.7

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The adhesive tape thus obtained had a crushing hardness H 14 of 22 N / cm 2. The force Steel adhesive was 3.4 N / cm.

Example 10

For the manufacture of an adhesive tape useful in the assembly of clichés, foamy and microglobo type for the industry the procedure was used as follows:

1st Stage of the process (preparation stage), manufacture of material 1 to be applied:

An acrylate adhesive composition based on a solvent, consisting of ethylhexyl acrylate (70%), acrylate stearyl (17%), acrylic acid (3%) and known resins (10%) are spread with an application thickness of 60 g / m2 on paper double-sided separator, dried, crosslinked and then rolled over.

2nd Stage of the process (preparation stage), manufacture of material 2 to be applied:

Process step 1 is repeated

3rd Stage of the process, coating with polyurethane:

Among the acrylate adhesive compositions spread on the separating paper of process steps 1 and 2 are carried out the coating with a polyurethane support mass of two components, degassed, at a speed of 1 m / min. He application thickness was 1.5 mm. The hardening was done at a channel temperature of 90 ° C.

The polyurethane support mass contained previously expanded thermoplastic plastic hollow balls
(Expancel®) and was composed of:

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Raw material Weight percentage (%) Component A Arcol 1042® 39.5 Arcol 1043® 39.5 Dilaurate dibutyl tin 0.2 Kronos 2160® 1.9 Calcium oxide 5.0 Expancel 551 DE 80® 3.0 Aerosil R 202® 3.5 Component B Vestanat IPDI® 7.4

The adhesive tape thus obtained had a crushing hardness H 14 of 30 N / cm 2. The force Steel adhesive was 2.9 N / cm.

Example 11

For the manufacture of an adhesive tape useful in the assembly of clichés, foamy nitrogen for the industry of the The procedure was used as follows:

1st Stage of the process (preparation stage), manufacture of material 1 to be applied:

An acrylate adhesive composition based on a solvent, consisting of ethylhexyl acrylate (70%), acrylate stearyl (17%), acrylic acid (3%) and known resins (10%) are spread with an application thickness of 60 g / m2 on paper double-sided separator customary in trade, dried, reticulated and then rolled.

2nd Stage of the process (preparation stage), manufacture of material 2 to be applied:

Process step 1 is repeated

3rd Stage of the process, coating with polyurethane:

Among the acrylate adhesive compositions spread on the separating paper of process steps 1 and 2 are carried out the coating with a polyurethane support mass of two components, degassed, at a speed of 1 m / min. In the Polyurethane support dough was introduced directly into the head mix the nitrogen, so that the hardened support It had a thickness of 0.7 g / cm3. The application thickness was 1.5 mm The hardening was carried out at a temperature of 90 ° channel.

The polyurethane support mass was composed by:

Raw material Weight percentage (%) Component A Arcol 1030® 17.0 Arcol 1067S® 40.0 Dilaurate dibutyl tin 0.2 Kronos 2160® 2.4 Calcium oxide 9.0 Aerosil R 202® 3.5 Component B Vestanat IPDI® 27.9

The adhesive tape thus obtained had a crushing hardness H 14 of 28 N / cm 2. The force Steel adhesive was 2.7 N / cm.

Claims (6)

1. Method for the continuous manufacture of self-adhesive articles, by which

to)

 be basically put in a container A a component based on polyol and in a container B a component based on isocyanate

b)

in a mixer mix the polyol component and that of isocyanate

C)

  the mixed polyurethane dough is then applied on a material support coated with an adhesive composition sensitive to Pressure

c2)

to a second material is added polyurethane mass of the sheet support

d)

the sheet of the first support material, the adhesive composition and the Polyurethane mass is passed through a heating channel, in which hardens the polyurethane dough,

d2)

after the heating channel it Remove the second support material.

and)

the sheet is then rolled in a station rolled.

2. Method according to claim 1, characterized in that the second support material has a pressure sensitive adhesive mass. 3. Method according to claims 1 to 2, characterized in that there are other containers prior to the mixer, in which are the catalysts, plasticizers, dyes and other additives, which can be placed and added. Method according to claims 1 to 3, characterized in that, the polyurethane mass is applied to the first support material coated with a pressure sensitive adhesive composition, so that the polyurethane mass is on the sensitive adhesive mass under pressure 5. Method according to claims 1 to 4, characterized in that, elements that do not have any adhesive substance, such as a separating paper or a separating sheet or paper, cloth, fleece, sheet or an elastomer. 6. Method according to one of claims 1 to 5, characterized in that the first and second support material travel at a constant speed.